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<h1><a name="ocxhtmlhelpactivexcontrol"></a>HTML Help ActiveX control overview</h1>

<p>The HTML Help ActiveX control (Hhctrl.ocx) provides a rich feature set for help systems. Key features include: an expanding table of contents, keyword search, shortcuts, and pop-up help topics. The control is one of the authoring components that ships with Microsoft HTML Help. It is also included with many third-party HTML Help authoring tools.</p>

<p>The control provides functionality for two types of help systems:</p>

<p><b>A compiled help (.chm) file</b>
<br>The control uses both an Internet Explorer DLL (Shdocvw.dll) and the HTML Help compiler to offer a variety of features. Users view compiled help files in the Help Viewer. Compiled help files often ship with the programs that they document.</p>

<p><b>Uncompiled HTML files on a Web site:</b>
<br>The control uses Microsoft Internet Explorer to provide a subset of its feature set. The features of HTML Help can be used on a Web site to present a wide variety of content, from Web-based help to a Web site focused on entertainment.</p>


<h3>Notes</h3>
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<li>The HTML Help ActiveX control is designed to work with Internet Explorer and the Shdocvw.dll component. It does not include the design-time support that is necessary to use it with development tools, such as Microsoft Visual Basic Scripting Edition and Microsoft Visual C++.</p>

<li>For more information about ActiveX technology, see Microsoft's <a href="http://www.microsoft.com/com/" target="_blank">Component Object Model (COM) technologies</a> Web site. </p>
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<td valign="top"><a href="ocx_intro.htm"><img src="proced.gif" alt="link to overview topic" border="0"></a>
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<td><a href="ocx_intro.htm">About the HTML Help ActiveX control reference</A>
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